<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>           
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" 
                        v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过 for 循环嵌套渲染二级权限 -->
                                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" 
                                v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <!-- 左列  二级-->
                                    <el-col :span="6">
                                        <el-tag type="success" closable
                                         @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 右列 三级-->
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3, i3) in item2.children" 
                                        :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>
                            {{scope.row}}
                        </pre> -->
                    </template>
                </el-table-column>
                
                <!-- 索引列 -->
                <el-table-column label="#" type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template  slot-scope="scope">
                        <!-- 修改按钮 -->
                        <el-button size="mini" type="primary" icon="el-icon-edit"
                        @click="shwoEditDialog(scope.row.id)">编辑</el-button>
                        <!-- 删除按钮 -->
                        <el-button size="mini" type="danger" icon="el-icon-delete"
                        @click="removeRoleById(scope.row.id)">删除</el-button>
                        <!-- 分配权限按钮 -->
                        <el-button size="mini" type="warning" icon="el-icon-setting"
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox 
            node-key="id" default-expand-all :default-checked-keys="defKeys"
            ref="treeRef"></el-tree>

            <span slot="footer" class="dialog-footer">
              <el-button @click="setRightDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>

         <!-- 添加角色的对话框 -->
        <el-dialog
            title="添加角色"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
            <!-- 内容主体区域 -->
            <el-form :model="addForm" :rules="addFormRules" 
            ref="addFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="addForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            
            <!-- 底部区域 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addRole">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改用户的对话框 -->
        <el-dialog
            title="修改角色"
            :visible.sync="editDialogVisible"
             width="50%"
             @close="editDialogClosed">

            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" 
            label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                  <el-input v-model="editForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                  <el-input v-model="editForm.roleDesc"></el-input>
                </el-form-item>               
            </el-form>

            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editRoleInfo">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>
<script>
export default {
    data() {
        return {
            //所有角色列表数据
            rolelist: [],
            //控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            //所有权限的数据
            rightslist: [],
            //树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            //默认选中的节点Id值的数组
            defKeys: [],
            //当前即将分配权限的角色id
            roleId: '',
            //控制添加角色对话框的显示与隐藏
            addDialogVisible: false,
            //添加角色的表单数据
            addForm: {
                roleName: '',
                roleDesc: ''
            },
            //添加表单的验证规则对象
            addFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' },
                    // { validator: checkRoleName, trigger: 'blur'} 
                ],
                roleDesc: [
                    { required: true, message: '请输入角色描述', trigger: 'blur' },
                    // { validator: checRoleDesc, trigger: 'blur'} 
                ]
            },
            //控制修改角色对话框的显示与隐藏
            editDialogVisible: false,
            // 查询到的角色信息对象
            editForm: {},
            //修改表单的验证规则对象
            editFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }
                ],
                roleDesc: [
                    { required: true, message: '请输入角色描述', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getRolesList()

    },
    methods: {
        //获取所有角色的列表
       async  getRolesList() {
          const { data: res } = await this.$http.get('roles')

          if(res.meta.status !== 200) {
              return this.$message.error('获取角色列表失败！')
          }
          
          this.rolelist = res.data

          console.log(this.rolelist)

        },
        //监听添加角色对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加新角色
        addRole() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                //可以发起添加用户的网络请求
                const {data: res} = await this.$http.post('roles', this.addForm)

                if(res.meta.status !== 201) {
                    this.$message.error('添加角色失败！')
                }

                this.$message.success('添加角色成功！')
                //隐藏添加角色的对话框
                this.addDialogVisible = false
                // 重新获取角色的列表数据
                this.getRolesList()
            })
        },
        //展示编辑角色的对话框
        async shwoEditDialog(id) {
            // console.log(id)
            const {data: res} = await this.$http.get('roles/' + id )

            if(res.meta.status !== 200) {
                return this.$message.error('查询角色信息失败！')
            }

            this.editForm = res.data
            this.editDialogVisible = true
        },
        //监听修改角色对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 修改角色信息并提交
        editRoleInfo() {
            this.$refs.editFormRef.validate(async valid => {
                // console.log(valid)

                if(!valid) return
                //发起修改角色信息的数据请求
                const {data: res} = await this.$http.put('roles/' + this.editForm.roleId, {
                    roleName: this.editForm.roleName,
                    roleDesc: this.editForm.roleDesc
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('更新角色信息失败！')
                }

                //关闭对话框
                this.editDialogVisible = false
                //刷新数据列表
                this.getRolesList()
                //提示修改成功
                this.$message.success('更新角色信息成功! ')
               
            })
        },
        // 根据 id 删除对应的角色信息
        async removeRoleById(id) {
            //询问用户是否删除数据
            const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
        }
        ).catch(err => err)

        //如果用户确认删除，则返回值为字符串 confirm 
        //如果用户取消了删除，则返回值为字符串 cancel
        // console.log(confirmResult)

        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除')
        }
        // console.log('确认了删除！')

        const {data: res} = await this.$http.delete('roles/' + id)

        if(res.meta.status !== 200) {
            return this.$message.error('删除用户失败！')
        }

        this.$message.success('删除用户成功！')
         //重新获取用户的列表数据
        this.getRolesList()
        },
        // 根据 id 删除对应的权限
        async removeRightById(role, rightId) {
            //弹框提示用户是否要删除
           const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }
            ).catch(err => err)

            if(confirmResult !== 'confirm') {
                return this.$message.info('取消了删除!')
            }
            console.log('确认了删除！')

            const {data: res} = await this.$http.delete(`roles/${role.id}
            /rights/${rightId}`)

            if(res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }

            //会发生页面的完整渲染，即刷新页面
            // this.getRolesList()
            role.children = res.data
        },
        //展示分配权限的对话框
        async showSetRightDialog(role) {
            //分配权限的id
            this.roleId = role.id
            //获取所有权限的数据
            const {data: res} = await this.$http.get('rights/tree')
            
            if(res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }

            //把获取到的权限数据保存到 data中
            this.rightslist = res.data
            console.log(this.rightslist)

            //递归获取三级节点的Id
           this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        //通过递归的形式，获取角色下所有三级权限的id，并保存到 defKey 数组中
        getLeafKeys(node, arr) {
            
            if(!node.children) {
                //如果当前 node 节点不包含 children 属性，则是三级节点
                return arr.push(node.id)
            }
                
            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        //点击为角色分配权限
        async allotRights() {
            const keys = [
                //...是展开运算符
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')

            const {data: res} = await this.$http.post(
                `roles/${this.roleId}/rights`,{rids: idStr })

                if(res.meta.status !== 200) {
                    return this.$message.error('分配权限失败！')
                }
                this.$message.success('分配权限成功！')
                //刷新数据列表
                this.getRolesList()
                //关闭整个对话框
                this.setRightDialogVisible = false
        }
    }
}
</script>
<style lang="less" scoped>
    .el-tag {
        margin: 7px;
    }

    .bdtop {
        border-top: 1px solid #eee;
    }

    .bdbottom {
        border-bottom: 1px solid #eee;
    }

    .vcenter {
        display: flex;
        align-items: center;
    }
</style>